OPEAS, CEYLON. 157 



Hapalus braueri MARTENS, Mittheil, aus der Zoolog. Samm- 

 lung des Mus. f. Naturkunde in Berlin, i, p. 24, pi. 2, f. 18. 



Resembles Acicula mauritiana H. Ad., in size and form, but 

 in that the penult, whorl is comparatively longer, and separ- 

 ated from the last whorl by a deeper suture. The reference 

 of this species to Hapalus seems to me of very doubtful ex- 

 pediency. It may be related to 0. goodalli; and indeed I 

 cannot readily see how it differs from that widely-spread 

 species. 



34. 0. SWIPTIANUM (Pfeiffer). PI. 23, fig. 26. 



Shell very slender, imperf 'orate, thin, yellowish-corneous, 

 glossy, very weakly sculptured with faint growth-wrinkles 

 which are nearly straight. Spire slender, with straight out- 

 lines and obtuse apex. Whorls iy 2 , moderately convex; su- 

 ture impressed, even, a narrow border below it slightly puck- 

 ered. Aperture small, ovate, the columella a little calloused, 

 very slightly excised below, and at the insertion above it 

 curves to the right. Length 7.8 diam. 2, length of aperture 

 2 mm. 



Mauritius (Nevill) ; introduced from the West Indies. 



This form is more slender than 0. gracile and much 

 smoother, and is imperf orate, the coluniellar reflection being 

 closely appressed. The suture is not crenulate. 



VI. Species of Ceylon, India and Southeastern Asia. 



Opeas gracile, mauritianum and probably some other of 

 the widely spread forms, occur in Ceylon, the former also in 

 India, east to Tonkin. Nevill, in his Handlist Ind. Mus. i, 

 p. 165, lists "Stenogyra (Opeas) nevilli G. Ad." from the 

 Dafla Hills. It is undescribed and unknown to me. 



35. 0. SYKESI n. sp. PI. 21, fig. 1, 2. 



Shell perforate, resembling 0. gracile in sculpture but with 

 the whorls much shorter, more compactly coiled, more numer- 

 ous in shells of the same length. Spire straightly and regu- 

 larly tapering to the small apex. Whorls 8^2 to 10, the 

 embryonic 1% smooth except for a minute subsutural radial 



